PM Industries and Process Equipment Pvt. Ltd.

Sigma Mixer

Sigma Mixer Overview

The Sigma Mixer is a robust, heavy-duty batch mixer specifically designed for processing high-viscosity materials such as adhesives, doughs, rubber compounds, sealants, and heavy pastes. The mixer features two counter-rotating, sigma-shaped blades that provide intense kneading and shearing action inside a horizontal, U-shaped trough. Its design allows thorough blending, wetting, and homogenization of dense and sticky substances that are beyond the capability of conventional mixers.

The Sigma Mixer is widely used in rubber, chemical, food, adhesives, explosives, and plastic processing industries where uniformity and viscosity control are critical.

Working Principle

The mixing action is carried out by two sigma-shaped blades that rotate toward each other at different speeds (usually in a fixed ratio of 3:2). This motion forces the material against the walls and across the trough, ensuring high shear and effective kneading. The mixer may be jacketed for controlled heating or cooling, and tilting discharge or bottom valves allow for complete material removal. The result is a homogeneous and consistent mass, even with very viscous materials.

Key Features

  • Dual sigma-shaped blades for intense kneading and shearing
  • Fixed-speed or variable-speed drive options
  • U-shaped horizontal trough with optional tilting or hydraulic discharge
  • Jacketed design for thermal control via steam, water, or oil
  • Suitable for high-viscosity and high-density materials
  • Heavy-duty gearboxes and drive systems for long service life
  • Available in GMP-compliant and explosion-proof designs
  • Vacuum-capable designs for moisture removal and degassing

Applications

  • Rubber and plastic compounding
  • Dough and bakery pastes
  • High-viscosity adhesives and sealants
  • PVC pastes and pigment dispersions
  • Putty, ceramic masses, and refractories
  • Solid-solid and solid-liquid heavy mixing

Technical Specifications

Parameter

Specification Range

Remarks

Working Capacity

50 to 5,000 Liters

Custom capacities available

Blade Type

Sigma-shape

Designed for strong shearing and kneading

Blade Speed Ratio

3:2 or customized

Ensures optimum folding and dispersion

Blade Material

SS 304 / SS 316 / Hardened Alloys

Wear-resistant for tough applications

Drive Type

Gearbox with motor (AC / VFD optional)

High torque at low RPM

Power Consumption

5 kW – 90 kW

Based on volume and viscosity

Trough Material

SS 304 / SS 316 / Carbon Steel

With mirror, matte or flameproof finish

Heating / Cooling

Jacketed (Steam / Oil / Water)

For precise temperature control

Discharge Type

Tilting trough / Bottom valve / Hydraulic

Ensures complete emptying without material loss

Sealing System

Stuffing box / Mechanical seals

Prevents leakage in pressure/vacuum applications

Control System

Manual, PLC, or SCADA compatible

Fully automated control systems available

Variants Available

  • Vacuum Sigma Mixer – For mixing under reduced pressure, drying, or degassing
  • Jacketed Sigma Mixer – With heating or cooling jacket for thermal-sensitive materials
  • Tilting Trough Model – Easy discharge for heavy or sticky materials
  • Explosion-Proof Mixer (ATEX Compliant) – For use in flammable environments
  • GMP-Compliant Pharma Models – For food-grade or pharmaceutical pastes

Downloads

Product Brochure (PDF)
Technical Datasheet

Processing high-viscosity materials?

Trust PM Industries and Process Equipment Pvt. Ltd. to deliver a Sigma Mixer tailored to your toughest mixing challenges. Contact our team for technical consultations, demo videos, and application-specific solutions.

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